Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
269 words
A variable ratio frictional drive gear comprising two axially spaced torous discs having respective toroidal mutually presented surfaces, a set of circumferentially spaced drive rollers in frictional rolling contact with the toroidal surfaces on the discs, a tangentially controlled roller carriage in which each of the rollers is rotatably mounted respectively, end portions of the roller carriages lying on respective roller tilt axes at right angles to axes of rotation of the rollers respectively, a support member whereby the end portions of the roller carriages are slidably and rotatably supported to permit the roller carriages to be moved tangentially in order to control indirectly the ratio angle of the rollers, a piston at one end portion of each roller carriage, a pressure cylinder in which the piston is slidable, said cylinder being in the support member and a guide portion at the other end portion, a guide cylinder in the support member in which the guide portion is slidable, a shaft to which the torous discs are rotatably connected, and on which the support member is mounted, said support member being rotatable relatively to said shaft, a valve, a valve member of the valve on which the support member acts, an hydraulic control circuit to control the tilting movement of said rollers, in which the valve is connected, the force exeRted by said support member upon said valve member being dependent upon the reaction force existing between the rollers of the torous discs, and change in the force exerted by the support member on the valve member will produce corresponding change of hydraulic fluid pressure in the control circuit.
Claim 2
Dependent Claim
269 words
A variable ratio frictional drive gear comprising two axially spaced torous discs having respective toroidal mutually presented surfaces, a set of circumferentially spaced drive rollers in frictional rolling contact with the toroidal surfaces on the discs, a tangentially controlled roller carriage in which each of the rollers is rotatably mounted respectively, end portions of the roller carriages lying on respective roller tilt axes at right angles to axes of rotation of the rollers respectively, a support member whereby the end portions of the roller carriages are slidably and rotatably supported to permit the roller carriages to be moved tangentially in order to control indirectly the ratio angle of the rollers, a piston at one end portion of each roller carriage, a pressure cylinder in which the piston is slidable, said cylinder being in the support member and a guide portion at the other end portion, a guide cylinder in the support member in which the guide portion is slidable, a shaft to which the torous discs are rotatably connected, and on which the support member is mounted, said support member being rotatable relatively to said shaft, a valve, a valve member of the valve on which the support member acts, an hydraulic control circuit to control the tilting movement of said rollers, in which the valve is connected, the force exeRted by said support member upon said valve member being dependent upon the reaction force existing between the rollers of the torous discs, and change in the force exerted by the support member on the valve member will produce corresponding change of hydraulic fluid pressure in the control circuit.
Claim 3
Dependent Claim
64 words
A variable ratio frictional drive gear as claimed in claim 1 wherein a pump supplies hydraulic pressurised fluid to said control circuit and a centrifugal governor has an hydraulic fluid input which is connected to an output of said pump, said valve also being connected to said output of the pump thereby to control the pressure of hydraulic fluid supplied to the governor input.
Claim 4
Dependent Claim
49 words
A variable ratio frictional drive gear as claimed in claim 2 wherein an hydraulic fluid outlet of said governor is connected to said pressure cylinders, the degree of communication between said input and said outlet of the governor being varied, in accordance with speed of rotation of said governor.
Claim 5
Dependent Claim
65 words
A variable ratio frictional drive gear as claimed in claim 1 wherein the valve has a body with a port, said valve member being movable by said support member to a region of said port and a drain connected to said port, and movement of the valve member to vary the coverage of said port controls the pressure of fluid in said hydraulic control circuit.